Program $1$:

$//$ comment: $n$ is a positive integer in this program

Function Add$\_$Numbers$($int n$)$:

if $(n==1)$ :

Print$("$result of $n=1$ is equal to $1")$;

Return $1$;

Else $(n>1)$ :

Print $("$the input number is more than $1")$

Return n $+$ Add$\_$Numbers$($n$-1)$